/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.wangwei.pdf;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.io.RandomAccessFile;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.edit.PDPageContentStream;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDCcitt;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDJpeg;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage;

/**
 * This is an example that creates a reads a document and adds an image to it.. The example is taken from the pdf file
 * format specification.
 *
 * @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
 * @version $Revision: 1.1 $
 */
public class AddImageToPDF {

    /**
     * Add an image to an existing PDF document.
     *
     * @param inputFile The input PDF to add the image to.
     * @param image The filename of the image to put in the PDF.
     * @param outputFile The file to write to the pdf to.
     * @throws IOException If there is an error writing the data.
     * @throws COSVisitorException If there is an error writing the PDF.
     */
    public void createPDFFromImage(String inputFile, String image, String outputFile) throws IOException,
    COSVisitorException {
        // the document
        PDDocument doc = null;
        try {
            doc = PDDocument.load(inputFile);

            // we will add the image to the first page.
            PDPage page = (PDPage) doc.getDocumentCatalog().getAllPages().get(0);

            PDXObjectImage ximage = null;
            if (image.toLowerCase().endsWith(".jpg")) {
                ximage = new PDJpeg(doc, new FileInputStream(image));
            }
            else if (image.toLowerCase().endsWith(".tif") || image.toLowerCase().endsWith(".tiff")) {
                ximage = new PDCcitt(doc, new RandomAccessFile(new File(image), "r"));
            }
            else {
                BufferedImage awtImage = ImageIO.read(new File(image));
                ximage = new PDPixelMap(doc, awtImage);
            }
            PDPageContentStream contentStream = new PDPageContentStream(doc, page, true, true);

            // contentStream.drawImage(ximage, 20, 20 );
            // better method inspired by http://stackoverflow.com/a/22318681/535646
            float scale = 1f; // reduce this value if the image is too large
            contentStream.drawXObject(ximage, 20, 20, ximage.getWidth() * scale, ximage.getHeight() * scale);

            contentStream.close();
            doc.save(outputFile);
        }
        finally {
            if (doc != null) {
                doc.close();
            }
        }
    }
}
